CC: Shahaji Bhosle Sorry, missed you in CC list.
Best regards, Ilya Maximets. On 15.06.2018 10:44, Ilya Maximets wrote: >> Hi, >> I just upgraded from OvS 2.7 + DPDK 16.11 to OvS2.9 + DPDK 17.11 and >> running into performance issue with 64 Byte packet rate. One interesting >> thing that I notice that even at very light load from IXIA the processing >> cycles on all the PMD threads run close to 100% of the cpu cycle on 2.9 >> OvS, but on OvS 2.7 even under full load the processing cycles remain at >> 75% of the cpu cycles. >> >> Attaching the FlameGraphs of both the versions, the only thing that pops >> out to me is the new way invoking netdev_send() is on 2.9 is being invoked >> via dp_netdev_pmd_flush_output_packets() which seems to be adding another >> ~11% to the whole rx to tx path. >> >> I also did try the tx-flush-interval to 50 and more it does seem to help, >> but not significant enough to match the 2.7 performance. >> >> >> Any help or ideas would be really great. Thanks, Shahaji > > Hello, Shahaji. > Could you, please, describe your testing scenario in more details? Also, > mail-list filters attachments, so they are not available. You need to > publish them somewhere else or write in text format inside the letter. > > About the performance itself: Some performance degradation because of > output batching is expected for tests with low number of flows or simple > PHY-PHY tests. It was mainly targeted for cases with relatively large > number of flows, for amortizing of vhost-user penalties (PHY-VM-PHY, > VM-VM cases), OVS bonding cases. > > If your test involves vhost-user ports, then you should also consider > vhost-user performance regression in stable DPDK 17.11 because of fixes > for CVE-2018-1059. Related bug: > https://dpdk.org/tracker/show_bug.cgi?id=48 > > It'll be good if you'll be able to test OVS 2.8 + DPDK 17.05. There was > too many changes since 2.7. It'll be hard to track down the root cause. > > Best regards, Ilya Maximets. > _______________________________________________ dev mailing list [email protected] https://mail.openvswitch.org/mailman/listinfo/ovs-dev
